溶接部ならびに鋳物透過X線写真にあらわれる影(第2報)
溶接条件と影
1974 年 43 巻 1 号 p. 12-22
詳細
1974 年 43 巻 1 号 p. 12-22
Effect of welding conditions on the mottling that appearing on radiograph of austenitic stainless steel weldments was investigated. the results may be summarized as follows.
1. the mottled appearance is related to the δ ferrite content in the weldment. The mottling is more pronounced when the δ ferrite content is low. It lose its contrast with an increase in content of the δ ferrite and it almost disappeared when the δ ferrite content come up to about 6%.
2. the mottling is more pronounced when travel velocity is lowered, accompanied by a decrease in 6 ferrite content in the weldment.
3. the mottling is more pronounced when a 25:20 filler metal is used instead of a 19:9 filler metal, accompanied by a decrease in δ ferrite content in the weldment.
4. the mottling is more pronounced with an increase in sulfur content in the weldment.
5. the results obtained in this investigation seem to suggest that low density grain boundary containing voids, microfisures or impurities may be important concerning the mechanism of the mottled appearance.
